FPP sluggish / nonresponsive after ~24 hours on F40D

[DannyT]

I have a new F40D, and noticed that FPP became unresponsive overnight.  It's running v3.4.2.   I ssh into it and dmesg is showing an exception stack on boot, which I don't know if that's normal or not.

/var/log/messages shows several exception stacks:
Nov  7 14:55:17 FPP kernel: [    0.338754] ------------[ cut here ]------------
Nov  7 14:55:17 FPP kernel: [    0.338784] WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:828 clk_core_disable_lock+0x17/0x20
Nov  7 14:55:17 FPP kernel: [    0.338788] l4_per_cm:clk:00d4:0 already disabled
Nov  7 14:55:17 FPP kernel: [    0.338792] Modules linked in:


I have no idea if this is causing the sluggish behavior, but a restart of FPP solves the issue.  Nothing is running, and the F40D is idle.
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